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Chris(aka-Moose)
Chris(aka-Moose), Nissan Technician
Category: Nissan
Satisfied Customers: 621
Experience:  16 years of experience
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My maxima's ac stopped cooling today and when I open the

Customer Question

My maxima's ac stopped cooling today and when I open the hood when the engine is idling I hear an intermittant sound a bit like popcorn popping/metalic knock.
Submitted: 2 years ago.
Category: Nissan
Expert:  Jay replied 2 years ago.

Hi, My name is*****'m happy to help you. During our conversation, I may be presenting you with different things to try, and ask you some Questions to get a better understand of the issue so I can answer your question properly. So stick with me to the end, and I am sure we should be able to get this issue resolved for you!

If you turn the Ac off, does the noise stop?

Customer: replied 2 years ago.
Thanks for help. No, when I turn the AC button off inside the noise still happens. It also does not seem like is coming from the AC compressor but under it somewhere in the middle of the vehicle.
Customer: replied 2 years ago.
AC has been fine but suddenly stopped cooling this afternoon on my drive home.
Expert:  Jay replied 2 years ago.

Any chance you can take a video clip of the noise so I can hear it?

Customer: replied 2 years ago.
great idea...give me a second.
Expert:  Jay replied 2 years ago.

ok..

Customer: replied 2 years ago.
uploading now. Had to record it then get on my pc. You will hear the engine and if you listen careful you will hear the rattle noise/knocking low noise off and on. https://www.dropbox.com/s/fa2yu3ml2v9e9dv/2015-08-03_21-18-47_164.wav?dl=0
Customer: replied 2 years ago.
it would not let me upload it
Customer: replied 2 years ago.
hit the link to my dropbox link to that file. Is talking an extra $18 on top of the $20?
Customer: replied 2 years ago.
you will have to turn your volume up and listen carefully.
Expert:  Jay replied 2 years ago.

hold on..

Customer: replied 2 years ago.
Were you able to listen to it?
Customer: replied 2 years ago.
Thanks. Our messages crossed.
Expert:  Jay replied 2 years ago.

I hear it. I thought I would be able to see where you are filming as well. But that is ok I guess.

If you are standing over the engine, does it sound like it's more on the passenger side towards the front?

Customer: replied 2 years ago.
I would say more passenger side but nearer center of engine towards the dash side. Really hard as an amateur to work out where.
Customer: replied 2 years ago.
Do you think the noise is related to the failure of the AC cooling today or something totally different?
Expert:  Jay replied 2 years ago.

Ok. But the engine is outside the car, not inside correct?

Expert:  Jay replied 2 years ago.

It could be.. I am trying to determine that..

Customer: replied 2 years ago.
The engine is in the engine compartment....regular 2009 Nissan Maxima.
Customer: replied 2 years ago.
I can do a video if that is needed.
Expert:  Jay replied 2 years ago.

yeah.. Move the video around also. Even go under the front of the car if you can on the passenger side..

Customer: replied 2 years ago.
k
Expert:  Jay replied 2 years ago.

Give me a few .. Need to take the dog for a walk.. brb. Take your time

Customer: replied 2 years ago.
okay with you in a second.
Customer: replied 2 years ago.
I was definitely louder listening underneath the car.
Customer: replied 2 years ago.
internet a little bit slow.
Customer: replied 2 years ago.
I will have two links. One from the above, one from below.
Customer: replied 2 years ago.
taking forever to save these. Do you have an icloud email I can use for photo sharing?
Customer: replied 2 years ago.
I restarted the upload...working now..sorry.
Customer: replied 2 years ago.
Are you still with me?
Customer: replied 2 years ago.
I am having a lot of problems (unusual) trying to upload the files to dropbox. one last try now.
Customer: replied 2 years ago.
here goes - file 1 - https://www.dropbox.com/s/1kk9rafvy5ur6vc/File%20Aug%2003%2C%209%2057%2007%20PM.mov?dl=0
Customer: replied 2 years ago.
2 https://www.dropbox.com/s/nf28eb2j6e41moc/File%20Aug%2003%2C%2010%2003%2036%20PM.mov?dl=0
Expert:  Jay replied 2 years ago.

Sorry, Hang on..

Yes I am here

Customer: replied 2 years ago.
The links should work. I tried them.
Expert:  Jay replied 2 years ago.

got 1 hang on

Expert:  Jay replied 2 years ago.

I keep listening to it over and over...

Customer: replied 2 years ago.
I know it is pretty odd.
Customer: replied 2 years ago.
I never /rarely open the hood. It could have been doing this for a while and I only noticed tonight when I opened it when troubleshooting the AC issue.
Expert:  Jay replied 2 years ago.

Damn.. That noise is odd...

Expert:  Jay replied 2 years ago.

Part of me thinks it's a broke up Catt knocking around..

Expert:  Jay replied 2 years ago.

Just trying to determine if it's related to the AC issue...

Customer: replied 2 years ago.
117,000 on the clock. Guess anything could start to go.
Customer: replied 2 years ago.
Only me and my father in law (he owned it out of the dealership) have owned it. It is well maintained.
Customer: replied 2 years ago.
ok.
Customer: replied 2 years ago.
Fan runs inside the car with air blowing warm, I hit the ac button and it seems to increase a little bit flow wise but now cooling.
Customer: replied 2 years ago.
no cooling sorry.
Expert:  Jay replied 2 years ago.

I must be going on 10 times..... watching and listening..lol

Customer: replied 2 years ago.
appreciate you looking into it.
Expert:  Jay replied 2 years ago.

When you hit the AC switch, does the Radiator fans kick on?

Customer: replied 2 years ago.
No idea. Not sure if I can tell that. It is 90 degrees here..ATlanta...so it is running a lot
Customer: replied 2 years ago.
even without AC.
Customer: replied 2 years ago.
I think...not that techie on cars.
Customer: replied 2 years ago.
I need to go in about 5 mins.
Expert:  Jay replied 2 years ago.

I am starting to think you may have a AC leak and lost your freon, and that the knocking may be a Broken up Catt converter.

Expert:  Jay replied 2 years ago.

I would love it if I can just speak with you. I am sure I can give you direction needed to resolve this..

Expert:  Jay replied 2 years ago.

The first thing I would say you need to have done is to recover the freon from the AC system. See how much is in there. If there isn't enough freon, the AC won't come on. If stone hit the condensor, or a o-ring let go, the freon may have escaped which is causing your AC issue.

Expert:  Jay replied 2 years ago.

https://www.youtube.com/watch?v=rec8Rb9cDx4